One thing you can certainly say about the Foo Fighters: They're a dedicated bunch. For further proof of this, look no further than Tuesday night's "Live On Letterman" performance, which took place at the iconic Ed Sullivan Theater in New York, site of the Beatles' first U.S. performance in 1964. So, of course, the Foos felt compelled to mimic the Fab Four's famed get-ups black suits, white shirts, skinny ties and black dress shoes — even though, as Dave Grohl would confess midway through their set, "these f---in' suits are so hot."

They also took the opportunity to turn the performance into a defacto album-release party for their brand-new Wasting Light disc, blasting through the album in its entirety (as they've been doing these days) and then tacking on a second hour of nothing but hits. Because, really, why not?

The first 60 minutes highlighted Lights' many strengths — namely, the growling guitars, pounding drums and stalking basslines of songs like "Bridge Burning," "Rope" and, of course, "White Limo," which featured an extended display of percussive pyrotechnics from Taylor Hawkins. Tracks like "Dear Rosemary" and "I Should Have Known" also added a more solemn side to the proceedings, each starting soft and somber before growing to absolute powerhouses.

As the first hour neared to a close and the last song on Wasting Light was played, fans were in for a special treat: another 60 minutes of Foo Fighters' previous hits. And, together for the past 16 years, there were a slew of them ... "All My Life," "Times Like These," "My Hero" (which Grohl dedicated to David Letterman), "Monkey Wrench" and more. But as the energy in the room increased with each successive smash, so did the temperature ... which probably should have been the Foos cue to ditch the Beatle getups. Only, they didn't.

"It’s so disgusting underneath this jacket right now. I feel like a wet snake," Grohl laughed, before shooting down a fan's request to "Take it off."

"No, that would ruin everything! It’s supposed to look perfect. This is my party," he said. "We were trying to figure it out. Guys like us can’t really ever get dressed up. We either look like a stoner going to court or someone that’s too old going to prom."